#version 330 core

uniform sampler2D mainTex;

in vec2 uv0;
out vec4 fragColor;

void main()
{
    vec4 c = texture(mainTex, uv0);
    fragColor = vec4(c.r, c.r, c.r, c.r);
    // fragColor = vec4(0.0, 1.0, 1.0, 1.0);
}
